I'm guessing you're referring to the hub nut. Yes, there is a tool needed to hold the hub in place while you unscrew that nut. It takes quite a bit of force as that nut is supposed to be torqued down to 190 Nm. I've heard of some people being able to remove it with an air impact gun, but I haven't tried it myself. The nut should take a 32mm socket, which is usually an item you have to order. I just got one from Sears online.
The clutch holding tools can be found many places. Here is one for reference.http://www.nicholsmfg.com/clutchHubTool.html. They all seem to run right around the $75 range. I just made myself one out of some old clutch plates this weekend. I welded two plates together, a spacer, and a strip of bar stock on top of that for a handle. Ask around, someone might have one you can borrow. If you can't find one, you can borrow mine once I'm done with it.
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